While the original Starship has a payload capacity of up to 100 ton, NASA's requirement for the HLS is only 12 ton. I wonder if SpaceX will reduce the size of the Moonship accordingly. This could be done by shortening the tank section only, so critical features like the crew cabin and engine section stay the same as for a full-sized Starship.
A full sized Moonship may have a dry mass of ~80 ton (heat shield and 3 sea level Raptors already deducted).
A "Moonship-Light" can have a dry mass of ~67 ton only , which brings down the fuel mass for a Lunar mission to 600 ton.
This would require 4 tanker flights only, which is an advantage over the 6-7 tankers for a full sized ship.
And the growth-option for future missions would still be there by enlarging the tank section if required.
Do you think SpaceX will downsize their design to suit NASA's requirements, or would they rather keep their standard design for all mission types?
No, I think they will keep it, since it was part of the offer. Also it was the big advantage from NASAs perspective, the potential for future growth.
Yes, its looking oversized. But at the same time, this means: The risk is very low, that future engineering results in it missing the NASA performance requirements. SpaceX could half payload mass with a heavier structure, and it would still work out. The other designs already failed on the paper and need to cut away mass or increase propellant mass to compensate.